RT Journal Article SR Electronic T1 “Portfolio Theory is Alive and well” JF The Journal of Investing FD Institutional Investor Journals SP 24 OP 44 DO 10.3905/joi.3.3.24 VO 3 IS 3 A1 Brian M. Rom A1 Kathleen W. Ferguson YR 1994 UL https://pm-research.com/content/3/3/24.abstract AB